feat: AUTO chain rewrite — silent failover+busy skip+pref round-robin+503 tier summary; chain edits reset slot cooldowns (P0/P1); stats by_status + audit jsonl rotation; UI priority-page health badges & status-code card; ctx-menu capture-phase close (outside-press guard); main.go ops warnings; local bundled-Lua verified tests (3 latent bugs fixed); plan.md

internal/gateway/server.go

@@ -15,7 +15,6 @@ import (
 	"net/url"
 	"strings"
 	"sync"
-	"sync/atomic"
 	"time"
 
 	"llmsproxy/internal/config"
@@ -27,12 +26,11 @@ var uiFS embed.FS
 
 // Gateway is the HTTP handler for the OpenAI-compatible endpoint + web UI.
 type Gateway struct {
-	core       *core.Core
-	ui         http.Handler
-	stats      *Stats
-	probeMu    sync.Mutex
-	lastProbe  time.Time
-	autoRR     atomic.Uint64
+	core      *core.Core
+	ui        http.Handler
+	stats     *Stats
+	probeMu   sync.Mutex
+	lastProbe time.Time
 }
 
 func New(c *core.Core, gatewayKeys []string) (*Gateway, error) {
@@ -131,6 +129,8 @@ func (g *Gateway) routes(w http.ResponseWriter, r *http.Request) {
 		g.handleChat(w, r)
 	case r.URL.Path == "/api/status":
 		g.handleStatusAPI(w, r)
+	case r.URL.Path == "/api/status/reset":
+		g.handleResetHealth(w, r)
 	case r.URL.Path == "/api/stats" || strings.HasPrefix(r.URL.Path, "/api/stats/"):
 		g.handleStatsAPI(w, r)
 	case r.URL.Path == "/api/keys" || strings.HasPrefix(r.URL.Path, "/api/keys/"):
@@ -389,6 +389,22 @@ func (g *Gateway) ensureProbe(ctx context.Context) {
 	}
 }
 
+// handleResetHealth (admin) clears the per-source backoff state so a fixed
+// upstream or an edited AUTO priority chain becomes schedulable immediately.
+func (g *Gateway) handleResetHealth(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		writeError(w, http.StatusMethodNotAllowed, "method_not_allowed", "use POST")
+		return
+	}
+	if reqRole(r.Context()) != "admin" {
+		writeError(w, http.StatusForbidden, "forbidden", "admin role required")
+		return
+	}
+	g.core.ResetHealth()
+	g.stats.AppendAudit("config", map[string]interface{}{"action": "reset_health", "key": keyID(reqKey(r.Context()))})
+	writeJSON(w, http.StatusOK, map[string]interface{}{"ok": true})
+}
+
 func (g *Gateway) handleStatusAPI(w http.ResponseWriter, r *http.Request) {
 	g.ensureProbe(r.Context())
 	host := r.Host